WO2004068882A1 - Procede pour limiter les interferences dans un systeme de communication radio - Google Patents

Procede pour limiter les interferences dans un systeme de communication radio Download PDF

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Publication number
WO2004068882A1
WO2004068882A1 PCT/EP2003/014170 EP0314170W WO2004068882A1 WO 2004068882 A1 WO2004068882 A1 WO 2004068882A1 EP 0314170 W EP0314170 W EP 0314170W WO 2004068882 A1 WO2004068882 A1 WO 2004068882A1
Authority
WO
WIPO (PCT)
Prior art keywords
synchronization
subscriber
base station
radio
radio communication
Prior art date
Application number
PCT/EP2003/014170
Other languages
German (de)
English (en)
Inventor
Michael Färber
Jürgen Hofmann
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE2003103700 external-priority patent/DE10303700B4/de
Priority claimed from EP03001963A external-priority patent/EP1443782A1/fr
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU2003288253A priority Critical patent/AU2003288253A1/en
Publication of WO2004068882A1 publication Critical patent/WO2004068882A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the invention relates to a method for interference suppression in a radio communication system.
  • interference suppression methods are known, which are designed either as stochastic or as deterministic interference suppression methods.
  • Interference suppression methods are carried out both on the subscriber side on a radio communication terminal and on the fixed network side on a base station. Such procedures were, for example, at the 3GPP TSG GERAN # 12, 18.-22. November 2002, Hospital Antipolis, France, in the documents "Single Antenna Interference Cancellation (SAIC) - proposed scenarios for evaluation and requirement specification", Ericsson, Nokia, Tdoc GP-022962, Agenda item 7.1.5.9 or in "SAIC: discussion on standardization and signaling *, Motorola Inc., Tdoc GP-023100, Agenda Item 7.1.5.9, or in "Simulation Assumptions for GSM SAIC", Motorola, GP-023101, Agenda Item 7.1.5.9, or in "Single Antenna Interference Cancellation ( SAIC): Whitening Process for adjacent interferers ", Nortel Networks, GP-023102, Agenda Item 7.1.5.9, or in” On the Potential Performance Gains of Single-Antenna Interference Cancellation and
  • interference suppression methods and further methods for interference suppression are to be used depending on the radio communication standard or on the temporal synchronization of base stations with one another there.
  • the present invention has for its object to provide an improved method for interference suppression for a radio communication system.
  • the invention is based on the knowledge that, even in the case of base stations considered to be synchronized in time, there are in reality differences in the synchronization. The reason for this is, on the one hand, that the individual radio communication standards for the base stations only require local synchronization accuracies to be maintained and, on the other hand, that they are design-related
  • Long-term stability of the synchronization is derived from clock signals assigned to network elements or from the transmission system used for their transmission (e.g. directional radio, ATM, PDH and SDH transmission).
  • neighboring base stations in a geographic region can use different network nodes as a reference.
  • a first base station of a geographical region uses a first base station controller BSC assigned to it as a reference for synchronization
  • a second base station adjacent to the first base station uses a second base station controller BSC assigned to it as a reference.
  • a real time synchronization to neighboring base stations of adjacent radio cells is determined at a base station under consideration. Based on the real synchronization, a so-called local degree of synchronization is assigned to each individual radio cell or each base station as a measure of the time synchronization of the considered base station to the respectively neighboring base station. A so-called “measure ent unit ⁇ MU is arranged as a reference at the base station under consideration.
  • the real synchronization is determined with the aid of the "Measurement Unit * MU, which is designed both to carry out the method according to the invention and to carry out conventional tasks of a" Local Measurement Unit * LMU.
  • the conventional tasks of an LMU include, as described in the 3GPP 43.059 specification, measurements, in particular time measurements, on radio signals and forwarding of the measurement results or determining radio field changes.
  • the “Measurement Unit w MU for performing the method according to the invention can be introduced into existing base stations as well as used in the so-called“ stand-alone ⁇ operation.
  • the “Measurement Unit 1 " MU particularly advantageously determines measurement information and local degrees of synchronization for the radio communication network without having to use radio transmission resources. With the help of the "Mersurement Unit * MU", corresponding information is made available to a so-called “Operation and Maintenance CenterA" or a "Radio Resource Management 1 ".
  • an interference situation on the radio communication terminal of the subscriber can be determined for each subscriber.
  • an algorithm is to be determined for each subscriber connection on the fixed network side, with the aid of which interference suppression on the subscriber's radio communication terminal can be optimized.
  • the radio communication terminal is designed to use different interference suppression methods, the radio communication terminal, for example, is informed of information about a synchronization quality determined on the fixed network side and about an interference load that can be assigned to the subscriber, which allows the radio communication terminal, a correspondingly optimal algorithm for interference suppression from those in the radio communication terminal to implement implemented interference suppression methods.
  • an algorithm for interference suppression determined on the fixed network side is transmitted to the radio communication terminal, or information characterizing an interference suppression method is transmitted to the radio communication terminal, which it transmits to the radio communication terminal allows the appropriate interference suppression method to be selected from the interference suppression methods implemented in the radio communication terminal.
  • radio transmission resources are allocated to the corresponding subscriber for data transmission on the fixed network side in such a way that the interference situation determined on the fixed network side on the radio communication terminal is improved.
  • Radio communication terminals that are designed to use interference suppression methods are determined with the help of the LMU portion of the “Measurement Unit * MU” and are taken into account accordingly when allocating radio transmission resources.
  • radio transmission resources are allocated taking into account the subscriber-specific interference situation, an increase in a subscriber density in the radio communication system is achieved.
  • a subscriber density in the radio communication system is achieved.
  • the so-called “Frequency Reuse 1 * factor” is optimized accordingly, it is possible to increase the subscriber density.
  • suitable threshold values for the subscriber density (“traffic load *) are introduced in order to adapt a channel occupancy level to the frequency reuse factor.
  • a correspondingly optimized interference suppression allows a frequency reuse factor of “l ⁇ ” , ie an entire spectral supply is repeated in each radio cell.
  • radio transmission channels from neighboring radio cells must not be occupied 100% of the time, because blocking probabilities alone according to an attaining theory, an allocation of radio transmission resources is to be restricted in order to achieve a desired blocking probability.
  • a second determining element is an average occupancy of interference cells that still allow a useful signal decoding.
  • the method according to the invention is therefore preferably used in FDD-TDMA radio communication systems in which a narrow frequency reuse, in the best case a frequency reuse factor of “1 N ⁇ , is aimed for.
  • corresponding radio transmission resources of the same carrier frequency can be assigned to those mobile subscribers whose radio communication terminals are provided for the use of interference suppression methods and which are accordingly insensitive to inter-cell interference in the case of adjacent radio cells.
  • mobile subscribers who cannot use these methods are allocated to radio transmission resources whose carrier frequency within neighboring base stations has a correspondingly higher frequency reuse.
  • Interference suppression methods that achieve a particularly high profit require both a certain quality of synchronism and a so-called “significant interferer 1 *”.
  • these parameters are determined at the location of the" Measurement Unit 1 * MU and signaled both to an "Operation and Maintenance System 1 * and to a facility for" Radio Resource Management 1 * RRM.
  • the network side decides whether higher or lower gains can be achieved with interference suppression.
  • the threshold value for the subscriber density on the radio transmission channels is readjusted. If, on the other hand, the synchronization of the base stations is of high quality and if an inadmissibly strong interferer is not detected by the "Measurement Unit 1 * MU," with the "Radio Resource Management * RRM an assignment in the same channel of an adjacent radio cell is carried out for those radio communication terminals. which have interference suppression facilities. This in turn takes into account an optimal profit.
  • an advantageous planning of the radio communication system is realized by a network operator - without having to use valuable radio transmission resources to determine the degrees of synchronization.
  • a fixed network connection of the “Measurement Unit 1 * MU” is carried out using a different transport medium than the radio transmission used for subscriber data transmission.
  • a network operator receives an economic advantage because a radio transmission capacity saved in this way is available for other signaling on the radio interface. Furthermore, an independent transport medium offers a higher transmission bandwidth, which means expanded or more frequent measurements can be carried out with high accuracy.
  • an improvement of the synchronization within the radio communication system is made possible, for example, by readjusting the time synchronization of individual base stations.
  • Base stations with a malfunction of the synchronization are recognized and readjusted accordingly.
  • the readjustment ensures a uniform quality of synchronization within the radio communication network.
  • the “synchronization islands 1 *” described above are minimized in their occurrence or in their deviation from a predefinable target synchronization.
  • the determination of the degrees of synchronization on the fixed network side according to the invention can be carried out independently of the extent of market penetration with radio communication terminals which are designed to carry out interference suppression methods.
  • the method according to the invention for interference suppression can also be used independently of this market penetration on the basis of the above-described allocation of suitable radio transmission resources on the fixed network side.
  • radio communication terminals are active in a radio cell, with the aid of which degrees of synchronization from neighboring base stations can be determined at the location of a subscriber, these degrees of synchronization obtained on the radio communication terminal can be transmitted to the fixed network and used there to increase the accuracy in the method according to the invention. If adaptive antenna systems are used on the base station side, an optimized radio cell size control with an optimized transmission quality is made possible.
  • FIG. 1 adjacent base stations of adjacent radio cells of a radio communication system in which the method according to the invention is used, and FIG. 2 a determination of degrees of synchronization of the base stations shown in FIG. 1.
  • FIG. 1 shows adjacent radio cells FZ1 to FZ7 with base stations BTS1 to BTS7 of a radio communication system for using the method according to the invention.
  • a radio communication system designed as a GSM / GERAN mobile radio network is considered to represent other standards.
  • a first subscriber TN1 of a first radio cell FZ1 is assigned to a first base station BTS1.
  • the first base station BTS1 sends a SCH burst SCHB1 as a synchronization signal from the subscribers assigned to the first radio cell FZ1, not shown here, via a SCH transmission channel.
  • the FZ7 which send synchronization signals in the form of SCH bursts SCHB2 to SCHB7 in order to synchronize the radio communication terminals of subscribers TN2 to TN7.
  • the SCH bursts SCHB2 to SCHB7 of the neighboring base stations BTS2 to BTS7 are received at the first base station BTS1 with the aid of a measure unit MU connected to the fixed network via transmission lines and evaluated to obtain degrees of synchronization.
  • the SCH burst of the SCH transmission channel is particularly suitable for this because it has a so-called “Extended Training Sequence 1 * with 64 bits.
  • the degrees of synchronization of the base stations BTS2 to BTS7 adjacent to the first base station BTS1 are determined by cross-correlation of a received SCH burst of an adjacent base station with a previously known training sequence of the SCH burst of the adjacent base station.
  • a “peak ⁇ with a corresponding time position representing the neighboring base station is generated in a clearly visible manner in the time domain.
  • This representative time position is compared with a time position of a “peak 1 *, which was generated with the aid of the training sequence of the SCH burst SCHB1 of the first base station BTS1. From the difference in the time slots of these “peaks 1 *, the degree of synchronization of the neighboring base station is now deduced, or a corresponding local degree of synchronization is assigned to the respective neighboring base station.
  • the synchronization quality between the base stations BTS2 to BTS7, based on the considered first base station BTS1, is determined.
  • Burst are transmitted and which represent the identifier of the respective base station, a corresponding assignment of the time position or the local degree of synchronization to the respective base station is possible within a table stored at the first base station.
  • FIG. 2 shows a determination of degrees of synchronization of the base stations BTS1 to BTS7 shown in FIG.
  • a correlation peak KOR1 to KOR7 which correlates with the correlation peak KORl of the first SCH-burst SCHBl., Is obtained from an extended midi MIDI to MID7 of each SCH burst SCHBl to SCHB7 used as a training sequence having.
  • the difference between a correlation peak KOR2 to KOR7 and the correlation peak KOR1 is a measure of the degree of synchronization of the base stations BTS2 to BTS7 to the first base station BTS1 at the location of the “Measurement Unit 1 * MU.
  • the first base station BTS1 is ideally synchronized in time with a second base station BTS2, since the difference tends to zero.
  • a maximum local degree of synchronization SYNMAX is thus assigned to the two base stations BTS1 and BTS2.
  • a third base station BTS3 with the first base station BTS1 is to be regarded as not synchronized in time, which is why a minimum local degree of synchronization SYNMIN is assigned to these two base stations BTS1 and BTS3.
  • the base stations BTS4 to BTS7 have a course in the time synchronization with the first base station BTS1, which is why corresponding base station pairs are assigned correspondingly running, ie correspondingly graduated, local synchronization degrees SYN.
  • the gradation or resolution between SYNMIN and SYNMAX can be determined by the system.
  • the gradations of the time synchronization are taken into account accordingly when selecting the interference suppression method on the fixed network side according to the invention and when determining the subscriber-specific interference situation on the radio communication terminal of the subscriber TN1.
  • a selection of suitable interference suppression methods can be found in the documents cited in the introduction to the description.
  • an intercell interference suppression method is selected for interfering subscriber signals based on the local degree of synchronization SYNMAX of the base station pair BTS1-BTS2, which is optimally suitable for subscriber signals that are synchronous with one another and interfering with one another - here, for example, for the subscriber TN1 interfering signal of the participant TN2. Based on the degree of synchronization of the base station pair
  • an intercell interference suppression method is selected which is optimally suitable for subscriber signals that are non-synchronous and interfering with one another - here, for example, for the subscriber TN3 signal interfering with subscriber TN1.
  • a common interference suppression method including several individual interference suppression methods can also be used, with the aid of which disruptive signals from the subscribers TN2 to TN7 are jointly eliminated at the radio communication terminal of the subscriber TN1.
  • the determined degrees of synchronization are averaged.
  • a power relationship between the synchronization signals of the base stations can be determined both in the radio communication terminal and in the “Measurement Unit 1 * MU.
  • a single interferer can be determined, the performance of which is significantly greater than the performance sum of further interferers.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé pour limiter les interférences dans un système de communication radio, une surveillance s'effectuant côté réseau fixe au niveau d'une première station de base d'une première cellule radio, sur des signaux de synchronisation issus de stations de base de cellules radio voisines. Pour chacune des stations de base voisines, la différence temporelle entre le signal de synchronisation des stations de base voisines et le signal de synchronisation de la première station de base, est déterminée, et, grâce à la différence temporelle de chaque cellule radio voisine, un degré de synchronisation est attribué à la première station de base comme étant représentatif de la synchronisation temporelle de la station de base voisine. A l'aide de coordonnées spatiales préalablement connues des stations de base, une situation d'interférence au niveau d'un appareil de communication radio d'un abonné associé à la première cellule radio, est déterminée, et des mesures de limitation d'interférences concernant l'abonné sont mises en oeuvre ou amorcées.
PCT/EP2003/014170 2003-01-30 2003-12-12 Procede pour limiter les interferences dans un systeme de communication radio WO2004068882A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003288253A AU2003288253A1 (en) 2003-01-30 2003-12-12 Method for carrying out interference suppression in a radio communications system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2003103700 DE10303700B4 (de) 2003-01-30 2003-01-30 Verfahren zur Interferenzunterdrückung
DE10303700.4 2003-01-30
EP03001963.2 2003-01-30
EP03001963A EP1443782A1 (fr) 2003-01-30 2003-01-30 Méthode pour supprimer les interférences dans un système de communications radio

Publications (1)

Publication Number Publication Date
WO2004068882A1 true WO2004068882A1 (fr) 2004-08-12

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AU (1) AU2003288253A1 (fr)
WO (1) WO2004068882A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020044614A1 (en) * 2000-09-12 2002-04-18 Molnar Karl James Methods and systems for reducing interference using co-channel interference mapping
US20020159547A1 (en) * 2001-02-09 2002-10-31 Bengt Lindoff Co-channel interference canceller
WO2002093965A1 (fr) * 2001-05-15 2002-11-21 Telefonaktiebolaget L M Ericsson (Publ) Suppression du brouillage dans le meme canal par estimation du temps d'arrivee (toa)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020044614A1 (en) * 2000-09-12 2002-04-18 Molnar Karl James Methods and systems for reducing interference using co-channel interference mapping
US20020159547A1 (en) * 2001-02-09 2002-10-31 Bengt Lindoff Co-channel interference canceller
WO2002093965A1 (fr) * 2001-05-15 2002-11-21 Telefonaktiebolaget L M Ericsson (Publ) Suppression du brouillage dans le meme canal par estimation du temps d'arrivee (toa)

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Publication number Publication date
AU2003288253A1 (en) 2004-08-23

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